Vacuum circuit breakers VCB VS1(ZN63) 12kV/24kV 630A/1250A
Nominal voltage: 12 кВт
Rated current: A 630-1250
Nominal frequency: 50 Hz
The ZN63 (VS1)-12 series indoor high-voltage vacuum circuit breaker is a three-phase indoor high-voltage AC switchgear with a 50 Hz frequency and a rated voltage of 12 kV. It is used as power grid equipment and power equipment for industrial and mining enterprises.
Equipment protection and control unit. The circuit breaker complies with Chinese national standards GB1984-2003 “High-voltage AC circuit breaker,” JB3855-96 “High-voltage AC vacuum circuit breaker for indoor use with voltage of 3.6-40.5 kV,” and JB3855-96 “High-voltage AC vacuum circuit breaker for indoor use with voltage of 3.6-40.5 kV.”
The “Circuit Breaker” specification, DUT403-2000 “Specifications for Ordering High-Voltage Indoor Vacuum Circuit Breakers 12-40.5 kV,” complies with the relevant requirements of IEC60694:1996, with a reliable interlocking function.
2 The ZN63 (VS1)-12 series indoor high-voltage vacuum circuit breakers feature an integrated spring mechanism and circuit breaker housing design, which can be used as a fixed mounting unit or combined with a vehicle chassis to form a hand truck unit.
Use environmental conditions
- Altitude: up to 1000 m
- Ambient temperature: Maximum temperature: +40°C; Minimum temperature: -15°C
- Ambient humidity
- Average daily relative humidity: <95% Average daily saturated vapor pressure: <2.2×10-2 MPa
- Average monthly relative humidity: <90% Average daily saturated vapor pressure: <1.8×102 mPa
- Places where there is no dripping water, fire, explosion, severe pollution, chemical corrosion, or strong vibration at the place of use
- Earthquake intensity does not exceed 8 degrees
- If there are special conditions of use, please specify them and discuss with the manufacturer when ordering.
Product structure and working principle
1 General structure of the circuit breaker
The general structure of the ZN63(VS1)-12 series indoor high-voltage vacuum circuit breaker is designed as a working mechanism and an arc quenching chamber located upstream and downstream, and the main part of the electrical circuit is a three-phase Floor-standing design. The vacuum arc interrupter is installed vertically in a tubular insulating cylinder, and the epoxy resin is cast into the insulating cylinder using the PNG method, which has high creep resistance. This design significantly reduces dust accumulation on the surface of the arc interrupter and simultaneously prevents damage to the vacuum arc interrupter from external random factors. It can also demonstrate high resistance to voltage in hot and humid conditions and heavily polluted environments.
2. Circuit Breaker Control Mechanism Structure. The control mechanism is a spring-loaded control mechanism located in a plane, which performs two functions: manual energy accumulation and electrical energy accumulation. The control mechanism is located in the enclosure in front of the arc interrupter. The enclosure is divided into five installation spaces by four intermediate partitions, which are equipped with the energy accumulation part of the operating mechanism, the transmission part, the tripping part, and the buffer part. This overall arrangement results in a rational design, so that the operating mechanism’s performance largely matches the characteristics required for opening and Closing. Closing the arc quenching chamber, reducing unnecessary intermediate transmission links, reducing power consumption and noise, and improving the reliability of the circuit breaker.
3. False Locking Protection
The circuit breaker can provide an ideal and reliable protection function against abnormal operation:
After the circuit breaker’s closing operation is completed, if the turnstile’s electrical signal is not removed in time, the surge protection control circuit inside the circuit breaker will disconnect the closing circuit to prevent repeated reclosing. When the manual circuit breaker fails to reach the test position or the non-operating position, the circuit breaker cannot be closed to prevent the circuit breaker from entering the load zone in the closed state. After the hand-trolley circuit breaker is closed in the operating position or test position, the hand-trolley cannot move to prevent it from being pulled or pushed into the load zone in the closed state.